Liquid dispensing system



June 21, 1932. w 5 LANCEY 1,864,233

LIQUID DISPENSING SYSTEM Filed March 12, 1930 3 Sheets-Sheet 2 I N V EN TOR.

M/mm/Z Di Z/MCE) BY My 9" MJ/ ArroRz ys.

June 21, 1932.

w. H. DE LANCEY LIQUID DISPENSING SYSTEM Filed March 12. 1950 3 Sheets-Sheet 5 wmmm s g INVENTOR. M/mmfi. fit [Mm BY 4 %/u& A TTORNEYS.

Patented June 21, 1932 UNITED STATES PATENT OFFICE WARREN H. DE LANCEY, OF SPRINGFIELD, MASSACHUSETTS, ASSIGNOR TO GILBERT & BARKER MANUFACTURING COMPANY, OF WEST SPRINGFIELD, MASSACHUSETTS, A

CORPORATION OF MASSACHUSETTS LVIQUID DISPENSING sYs'rm Application filed March 12, 1930. Serial No. 435,311.

charge nozzle. Any suitable means may be used for forcing the liquid through said line, meter and hose, such for example, as a pump, driven by an electric motor or otherwise in a manner enabling automatic operation. The problem is to control the pumping at a remote point, viz at the point of discharge,-

in this instance at the valve discharge nozzle.

This invention provides for the automatic control at the remote point byutilizing, as a groundwork, an old expedient, disclosed in U. S. Letters Patent No. 1,247,544, granted November 20, 1917, on an invention of H. W. Kimes. In such patent, there is provided a water pumping system, including an electrically driven pump with a controlling switch actuated according to the pressure-ex isting in the pipe line served by the pump. \Vhen the outlet valve in said line is closed, pressure builds up in the line to a degree sufficient to opensaid switch and cause the stopping of the pump; On opening the outlet valve. the pressure in the line drops sufliciently to close the switch and cause the pump to be started. The pump continues in operation while the outlet valve is open.

An attempt has been made heretofore to provide a gasoline dispensing system operating on the principle of the Kimes patent. In U. S. Letters Patent No. 1,566,591, granted December 22, 1925. to 'C. A. Goldsmith and J. F. Montague, there is shown a gasoline dispensing system similar in principle and operation to the water dispensing system of the Kimes patent but having in addition a meter and a flexible hose terminating with a valved hose nozzle.

This invention is directed to and has for its object the provision of means which will render safe and foolproof a pressure control of the general character described.

One of the fundamental difliculties incident to pressure control is that a drop in presj sure, from any cause, will operate the switch of the pump motor. A lead, even though small, will in time cause a suflicient drop in pressure to close the switch and there is the danger that the pump motor may be started at an inopportune time. The problem,

while present to some degree in a water dispensing system, is not so serious. When gasoline is the liquid dispensed, there is a fire hazard to be reckoned with that is not present in the water dispensing system. Also, in the latter system, the piping is all fixed and, if properly installed, leaks are unlikely to develop. In the gasoline dispensing sytem, the problem is complicated by the flexible delivery hose which is subjected to rough handling. A leak may develop in the hose when it would be unlikely to develop in the fixed piping. Also, the hose may be torn loose from the dispensing housing or it may be run over by a truck. There are thus various conditions, any one of which may cause a leakage of gasoline and, if a leak develops, one does not want the pump to start up automaticall and force out quantities of gasoline throng the leak to cause a fire hazard. This invention is directed to the prevention of trouble from such sources.

The above and other objects will more particularly appear as the detailed description proceeds and will be pointed out in the appended claims.

The invention will be disclosed with reference to the accompanying drawings, in which l Fig. 1 is a small scale elevational View of a dispensing apparatus embodying my invention,the housing of the apparatus being shown in section to reveal interior mechanism;

Fig. 2 is a fragmentary central sectional elevational view of the apparatus taken from the same direction as Fig. 1 but drawn to larger scale;

Fig. 3 is a fragmentary cross sectional view of the apparatus, taken at right angles to Fig. 2;

igs. 4 and 5 are plan and elevational views, respectively, partly in section, of the pressure controlled switch; and

Figs. 6 and 7 are detail views of the spring actuating mechanism of said switch,-showing the switch lever thereof in off and on positions, respectively.

The liquid dispensing system in its main essentials, involves nothing more than a pipe line with a meter interposed therein, a discharge valve to control the flow, a power 0perated pump or its equivalent and a pressureactuated controlling means therefor. These elements may be mounted and arranged in any suitable or desired way. As a practical matter, the aforesaid elements are, for convenience, mounted in or assembled on a common frame or housing and the invention is disclosed herein in that form.

Referring to Fig. 1, a frame is provided, comprising, a base 10, a series (four) of pipe columns 11 upstanding from the base, and a suitable cap 12 supported by the columns. A sheet metal housing 13 encloses the space between the cap and base'except for certain openings hereinafter described.

The meter is shown at 14, its dial case at 15, its dial at 16 and the pointer which cooperates with the dial at 17 The meter 14 is supported by and between a pair of plates 18 to which it is secured by nuts 19, in the same manner shown in Fig. 2 in connection with a second meter 14, later to be described. These plates 18 have upturned ends which are clamped to the pipe columns 11 by U-bolts 20 (see also Figs. 2 and.3).. An opening is provided .in housing 13 through which the dial of the meter is visible, as will be clear from Fig. 3.

The power operated pumping means consists of a rotary pump 21 (Fig. 1), driven from an electric motor 22 by a shaft 23. Both pump and 'motor are fixed to a common frame 24, secured to columns 11 as indicated. The motor is controlled by an electric switch (not shown) contained within a switch box 25, suitably supported in any way,as indicated in Fig. 3 by a bracket 26 secured to columns 11. A conduit 27 extends from near the base of the housing 13 upwardly tov box 25 and has a branch leading to the motor 22. It will be understood that this conduit contains the wires connecting the switch and motor to a suitable source of electricity.

Liquid, such as gasoline, is drawn up from an underground supply tank by pump 21 through a suction pipe shown in part at 28. Such liquid is forced by the pump through a pipe 29 to meter 14 and thence by way of a pipe 30, and a suitable flow indicator 31 (if desired), to a flexible delivery hose 32 which terminates with a valved nozzle 33. The valve of this nozzle closes automatically and is normally closed. It can be opened by mov- I ing a lever 34 toward the body of the nozzle.

The lever is usually protected by a guard 35, by means of which it may be hung up, when not in use, on a support 36. The latter projects outside housing 13 and is secured to a lug 37 (best shown in Fig. 2), depending from one of the plates 18. An upstanding ear 38 on support 36 passes through guard 35, when the latter is on the support, and is per forated as shown, enabling a padlock to be passed therethrough to lock the nozzle against removal. The ear 38 also prevents the lever 34 from being moved to open the nozzle valve, when the nozzle is hung up as described. The delivery end of the nozzle, when thus supported, extends through an opening 39 (Fig. 2) in housing 13 into the interior of the latter.

In some cases, it may be desirable to make provisions so that more than one dispensing operation can be carried on at the same time from the one apparatus. When this is the case, I provide another meter and hose and connect them up to be served by the same pumping means. Thus, the meter 14 (Fig. 2) is connected by a pipe 29 to the discharge pipe 29 of pump 2l'and discharges into a hose 32 (shown in part in Fig. 1). The various other parts associated with the meter 14 and hose 32' are identical with those described in connection with meter 14 and hose 32 and have been marked by corresponding reference numerals with the addition of a prime.

The pressure-actuated, switch-operating mechanism is best shown in Figs. 4and 5. It is mounted with switch box 25 on a plate 40. An expansible bellows 41 is supported on plate 40 and its otherwise open lower end is closed by the plate and secured thereto in any suitable, liquid-tight manner. The interior of the bellows 41 is connected to the pipe 29 and thus to pipe 29, by a pipe 42 (see Fig. 3). Supported by studs 43 from plate end by a plug 47 and threaded into the plug' is a screw 48, by which the position of the upper seat 49 for spring 46 may be ad usted. The mechanism may be adjusted by screw 48 to vary the pressure at which the switch will be operated. The lower spring seat 50 is integral with a plunger 50, which is slidable in pipe 45 and plate 44 and which is fixed to a plate 51 secured to the upper end of bellows 41. Plate 51 is notched (Fig. 4) to partially fit around studs 43 and this arrangement prevents turning of the plate from any cause. Plate 51 has fixed thereto a'bracknects stud 53 to a stud 55 fixed in the free end of the switch operating lever 56. The latter is fixed to a shaft 57 extending into the switch box 25 to operate the switch.

hen lever 56 is in its upper and illustrated position, wherein it abuts a stop 58 on box 25, the switch is off and the pull of spring 54 on the lever is so directed as to hold it against the stop 58 in off position (see also Fig. 6). This is the condition which exists when the valved hose nozzle or nozzles (in case two are used) are closed. Pressure builds up in the closed system, raises the top wall of bellows 41 and carries stud 53 into the illustrated position. As the pressure in the system drops, the stud 53 will be moved downwardly by spring 46 but no immediate movement of the switch lever will result. As soon, however, as the center of stud 53 crosses the line of centers of shaft 57 and stud 56, the pull of spring 54 will be so directed as to pull lever 56 away from stop 58 and the lever will be moved suddenly with a snap action into its lower and on position, shown in Fig. 7. There is a stop to limit the downward movement of lever 56 but this is a movable one utilized to perform another function and will be described below.

As a safety feature, I provide means whereby the automatic control may be rendered inoperative under certain conditions. Such means includes a collar 59 which underlies stud and forms the stop for lever 56, above referred to. Collar 59 is fixed to a rod 60, mounted for vertical sliding movement in a bearing provided on plate 40. The

collar, when rod 60 is released, is projected upwardly into the illustrated position by a spring 61. Upward movement of rod 60 is limited by acollar 62 thereon which abuts the lower face of the bearing for rod 60 as a stop. The collar, when thus moved upwardly, raises the switch lever 56, through the intermediary of stud 55, into off position. In normal operation, the collar 59 is depressed far enough to allow the switch lever 56 to move into the on position shown in Fig. 7 and it then serves temporarily as a fixed stop for limiting the downward movement of lever 56.

For controlling the position of rod 60, I provide a hand lever 63 (Figs. 2 and 3), or if two hoses are used, an additional hand lever 63 (Fig. 1). These levers are located outside the housing 13 one adjacent each hose nozzle support. The lever 63, for example, is mounted to swing from the position shown in 3 in a clockwise direction into a second position in which it interferes with the hanging up of the hose nozzle 33 on support 36. As. a consequence. the operator must move lever 63 into the illustrated position before the nozzle can be placed on its support.-

Such movement of lever 63 releases rod 60 and allows it to be raised by spring 61 into the illustrated position.

' Levers 63 and 63' are fixed to independent shafts 64 and 64 (Fig. 2), having bearings in lugs 37 and 37, respectively (Fig. 1). Shaft 64 has a sleeve 65 (Fig. 2) fixed to its inner end and the inner end of shaft 64 has a bearing in this sleeve. Shafts 64 and 64' have levers 66 and 66 (Figs. 1 and 3), respectively, fixed thereto. Lever 66 (Fig. 3) has a head 67 swivelled thereon and a push rod 68, threaded into such end for adjustment purposes, extends downwardly with its lower end slidably engaged in'the two outstanding legs of U-shaped piece 69. Lever 66' has similar parts associated therewith. The two U-shaped pieces 69 are disposed on opposite sides of the flattened upper end of rod 60 and are pivotally connected thereto by a pin 70.. The push rods 68 and 68' have shoulders 71 and 71 thereon to engage their respective members-69 and 69. When either lever 63 is moved into its second position. rod 68 will be depressed but movement of both levers back into the illustrated position is required before rod 60 is released and allowed to rise under the action of spring 61. The lever 63, when moved into'its second position is held there by a toggle action. The point of pivotal connection between lever 66 and push rod 68 crosses the line of centers connecting the center of shaft 64 and the center of the push rod receiving hole in member 69. A stop to limit the extent of movement across such line of centers is afforded by other means presently to be described.

Interposed in the supply pipe to meters 14 and 14' are valves 72 and 72' (Fig. 3) respectively, adapted to be operated by the le 'ers 66 and 66', respectively. The operating connections for each valve are similar and one set only will be described. Valve 72 has an upstanding operating shaft 73 to which is fixed a lever 74. Swivelled on the free end of this lever, and depending therefrom is a head 75 in which one end of a horizontal push rod 76 is engaged. The other end of rod" 76 is threaded (for adjustment purposes) into a head 77 swivelled in lever 66. Shoulders 7 8 on the push rod 76 engage and move head 75 when lever 63 is swung in a clockwise direction from the illustrated position into its second position, as above described. The valve lever 74 has only a limited range of movement and, when moved to open position by the described movement of lever 63, it serves as a stop to limit the extent of crossing centers action of lever 66 and push rod 68. The valve 72 is closed by the movement of lever 63 in a counterclockwise direction from its second position into the illustrated position. The closing movement of valve 72 18 preferably effected by push rod 76 through the intermediary of a spring 79, which yields, if and when necessary, after valve 72 has been closed to allow continued travel of the push rod and insure tight sealing of the valve.

To guard against the contingency that the hoses 32 or 32- might be torn from their supports, I provide another safety device which is effective, whenever abnormal strain is placed on the hose to throw the switch lever 56 to ofli' position. Referring to Fig. 2, a wire 80 is suitably attached to hose 32, as by the clamp 81, and at any suitable point. This wire is suitably guided, as by a tube 82, from the hose into the interior of housing 13, where it passes vertically downward, through a guide 83, to the control mechanism. A corresponding wire 80 is provided for hose 32' and connected to wire 80. The lower end of wire 80 is connected to a pawl 84. Referring now to Figs. 4 and 5, the pawl 84 is pivotally supported on a stud 85 from plate 40 and is normally held by a spring 86 in engagement with a shoulder 87 on a rod 88. Rod 88 is provided with a spring 89, acting between a collar 90 fixed thereon and member 40. When pawl 84 is lifted out of engagement with shoulder 87 by an upward pull on wire 80 or 80, the spring 89 will shift rod 88 to the right and cause a cam 91 thereon to elevate the stud 55 and move the switch lever 56 into off p0- housing 13 so that it can be manually moved by an operator, who has access thereto through an opening 92, far enough to allow pawl 84 to become reengaged with shoulder 87. Until rod 88 is reset, as described, cam 91 will prevent closing of the switch under the action of the pressure controlled means.

Assuming that the hose nozzles 33 and 33' are hung up on their respective supports 36 and 36 in looking position, the normal dispensing operation is as follows. One or both nozzles are removed from their supports, as required, and the levers 63 or 63, as the case may be, are turned to open valves 72 or 72'. The levers 63 and 63 operate independently of one another and open the valve in the delivery line of the particular meter which it controls. Either lever, when thus operated, will cause rod 60 to be depressed to move collar 59 away from stud 55 far enough to allow movement of the switch lever 56 to on position.

The apparatus is now set for remote control,such control being entirely effected from the nozzle end of the hose or hoses 32 and 32'. The operator, having inserted nozzle 33 or 33 in the tank to be filled, simply presses the lever 34 toward the body of the nozzle. This opens the discharge valve of the nozzle and causes a drop in pressure of the liquid in the delivery line. Such a drop in pressure, caused by the opening of either nozzle valve, will result in a contraction of bellows 41 under the force of spring 46. This in turn causes a lowering of stud 53 and, when the center of this stud crosses the line of centers, which connects the centers of stud 55 and shaft 57, the spring 54 will suddenly move the switch lever 56 to on position. The motor 22 is thus set in operation to drive pump 21 and force liquid through the delivery line, meter and hose to the customers tank. Where more than one meter and hose are used, the motor will not be stopped until the valve of both nozzles are closed. Where a single hose is used, which is a contemplated way of practicing the invention, the pump motor will be started and stopped by the opening and closing of the nozzle valve. In either case, as soon as the liquid dispensing system, as a whole, is closed the pressure rapidly builds up to a point where it expands bellows 41, elevates stud 53 high enough to cause spring 54 to move the switch lever to off-position, and cause the pump motor to stop.

As set forth above, the control of the means is, however, thought to be new. s1t1on. Rod 88 extends far enough towards The invention is principally characterized by the provision of safety devices to overcome serious practical difiiculties which have heretofore stood in the way of the commercial utilization of this form of control for gasoline dispensing systems. One possible trouble, which needs to be guarded against, is breakage of the hose. Suppose that the operator leaves the hose nozzle in the filling opening of the tank of an automoble and that the driver of the automoble starts to drive his machine away. The hose may perhaps be torn apart before the trouble is discovered. A drop in pressure in the deliver line results, the pump starts up and a stream of gasoline is forced out of the broken hose, causing a serious fire hazard. As will be seen, I have effectively guarded against this possible difiiculty, by providing power means, automatically operable when released to move the switch lever to off position and hold it there. Such mechanism is released by the flexible. transmission wire 80 connected to the hose at any suitable point so as to respond to abnormal tensile stress in the hose or to an unduly sharp bending of the same near its point of connection to the delivery piping. In the illustrative embodiment shown, the wire 80, or wire 80, will raise pawl 84 and enable the spring 89 to move cam 91, which by coaction with stud 55 raises the switch lever to off position.

A general source of trouble to be guarded against is leakage. Leakage in the fixed piping is seldom likely to happen but leakage in the hose or its end connections or in the nozzle valve is much more likely to occur because these elements are handled roughly by some operators. It is most important to guard against such leaks as occur while the pump is unattended. -One safeguard is to provlde a valve, such as 72, with means whereby the operator is forced to close the same before he can hang up the hose. But the valve might not close tightly so that this I expedient does not provide full insurance against the trouble. To secure such insurance, I provide means for rendering the pressure actuated switch inoperable when the hose is hung up in position for locking. Leaks,'wherever they occur, can then cause no damage insofar as causing the power pumping means to be set in operation, is concerned. This is accomplished by another power operated means, the spring 61 and collar 59, which is automatically operable when released to move the switch lever to off position, if not already so positioned, or to hold the lever in such position and prevent movement of it by the pressure operated means. s

The operator, having completed a dispensing operation, hangs up the hose by its nozzle 33, placing the same on support 36. Be-

' fore this can be done, lever 63 must be moved out of its on position in which it interferes with the placing of the nozzle on the support, into the illustrated position. This causes valve 72 to be closed and also releases rod 60 so that it can be moved up by spring 61 into the illustrated position. Where two hoses are used, either of the levers 63 or 63' will close its valve 72 or 72' but both levers must be moved to off 'position before a liquid delivery line terminating with a flexible hose, a normally closed valve at the delivery end of said hose, means for forcing liquid through said line and hose, means controlled by the pressure of liquid in said line for automatically startin and stopping said liquid forcing means, an safety means actuated by abnormal strain on said hose for stopping said forcing means.

2. A liquid dispensing system, comprising, a li uid delivery line terminatin with a flexi le hose, a normally closed va ve at the delivery end of said hose, means for forcmg liquid through said line and hose means controlled by the pressure of liquid in said-line for automatically starting and stopping said liquid forcing means, and safety means actuated by abnormal strain on said hose for rendering said pressure controlled means ineffective to start said pumping means.

3. A liquid dispensing system, comprising, a liquid delivery line terminating with a flexible hose, a normally closed valve at the delivery end of said hose, means for forcing liquid through said line and hose, means controlled by the pressure of liquid in said line for automatically starting and stopping said liquid forcing means, and safety means actuated by abnormal strain on said hose for stopping said forcing means and for preventing I said pressure controlled means from again starting said liquid forcing means.

'4. A liquid d1spensing system, comprising, a liquid delivery line terminating with a flexible hose, a normally closed valve at the delivery end of said hose, means for forcing liquid through said line and hose, a control member movable from one position to another to start and stop said forcing means, means controlled by the pressure of liquid in said line for automatically moving said member, said last named means operable on a predetermined increase in pressure above a predetermined pressure to move said member to stopping position and operable on a predetermined decrease in pressure below said predetermined pressure to move said member to starting position, and means actuated by abnormal strain on said hose to move said member to stopping position if not so positioned and to prevent it from being moved to startmg position by said pressure controlled means.

5. A liquid dispensing system, comprising, a liquid delivery line terminating with a flexible hose, a normally closed valve at the delivery end of said hose, means for forcing liquid through said line and hose, a control member. movable from one positlon to another to start and stop said forcing means, means controlled by the pressure of liquid in said line for automatically moving said member, said last named means operable on a predetermined increase in pressure above a predetermined pressure to move said member to stopping position and operable on a predetermined decrease in pressure below said predetermined pressure to move said member to starting position, normally-restrained power-operated means for moving said member to stopping position independently of said delivery end of said hose, means for forcing liquid through said line and hose, a control member movable from one position to another to start and stop said forcing means, means controlled by the pressure of liquid in said line for automatically moving said member, said last named means operable on a pre; determined increase in pressure above a predetermined pressure to move said member to stopping position and operable on a predetermined decrease in'pressure below sa1d'predetermined pressure to move said member to starting position, normally-restrained power-operated means for moving said member to stopping position independently of said pressure controlled means, means restraining movement of said power-operated means, and means actuated by abnormal strain on said hose for releasing said restraining means, said power-operated means adapted to be manually reset into position to be held by said restraining means.

7. A liquid dispensing system, comprising, a liquid delivery line terminating with a flexible hose, a normally closed valve at the delivery end of said hose, means for forcing liquid through said line and hose, a control member movable from one position to another to start and stop said forcing means,

means controlled by the pressure of liquid in said line for automatically moving said member, said last named means operable on a predetermined increase in pressure above a predetermined pressure to move said member to stopping position and operable on a predetermined decrease in pressure below said predetermined pressure to move said member to starting position, normally-restrained poweroperated means for moving said member to stopping position independently of said pressure controlled means, latching means restraining movement of said power-operated means, and means actuated by abnormal strain on said hose for releasing said restraining means, said last named means including a flexible transmission wire fixed to said hose and connected to said latching means.

8. A liquid dispensing system, comprising, a liquid delivery line terminating in a flexible hose, a valved nozzle connected to the delivery end of said hose, means for forcing liquid through said line and hose, means controlled by the pressure in said line for automatically starting and stopping said forcing means as necessary to maintain said line and hose full of liquid under a predetermined pressure, whereby on opening said valved nozzle said forcing means is automatically set in operation and on closing of said valved nozzle said forcingmeans is automatically stopped, and means actuated by abnormal strain on said hose for rendering said pressure controlled means ineffective to start said liquid forcing means.

9. A liquid dispensing system, comprising,

a liquid delivery line terminating in a flexible hose, a valved nozzle connected to the delivery end of said hose, means for forcing liquid through said line and hose, control means automatically responsive to the pressure in said line for starting and stopping said forcing means as necessary to maintain said line and hose full of liquid under a predetermined pressure, whereby on opening said valved nozzle said forcing means is automatically set in operation and on closing of said valved nozzle said forcing means is automatically stopped, means for supporting said nozzle when not in use, and manually operable means effective when moved into a predetermined position to prevent said control means under its automatic response to pressure variations from starting said liquid forcing means, said manually operable means except when in said predetermined position interfering with the placing of said nozzle on said supporting means.

10. A liquid dispensing system, comprising, a liquid delivery line terminating in a flexible hose, a valved nozzle connected to the de livery end of said hose, means for forcing liquid through said line and hose, control means automatically responsive to the pressure in said line for starting and stopping said forcing means as necessary to maintain said line and hose full of liquid under a predetermined pressure, whereby on opening said valved nozzle said forcing means is automatically set in operation and on closing of said valved nozzle said forcing means is automatically stopped, means for supporting said nozzle when not in use, and means for preventing said control means under its automatic response to pressure variations from starting said liquid forcing means when said nozzle is on said supporting means.

11. A liquid dispensing system, comprising, a liquid delivery line terminating in a flexible hose, a valved nozzle connected to the delivery end of said hose, means for forcing liquid through said line and hose, means controlled by the ressure in said line for automatically starting and stopping said forcing means as necessary to maintain said line and hose full of li uid under a predetermined pressure, where y on opening said valved nozzle said forcin means is automatically set n operation and on closing of said valved nozzle said forcing means is automatically stopped, a second valve in said delivery line, means for closing said 'second valve, and means actuated by the closing of the latter to prevent said liquid forcing means from being started by said pressure controlled means.

12. A liquid dispensing system, comprising, a liquid delivery line terminating in a flexible hose, a discharge nozzle on the delivery end of said hose having a normally closed valve, means for forcing liquid through said line and hose, a member movable from one position to another to start and stop said forcing means, means actuated by the pressure of the liquid in said line to move said member to stopping position and to move said member to starting position when said pressure falls below a predeterminedminimum, normally-restrained power-operated means operable when. released to move said member to stopping position and hold it against subsequent movement toward starting position under the action of said pressure controlled means, a support for said hose nozzle when not in use, and means compelling release of said power operated means when said nozzle is on said support.-

13. In a liquid dispensing system, a liquid delivery line including a flexible hose, a control valve at thedelivery endof said hose, electrically operated means for forcing liquid through said line, a switch to control said means, means actuated by the pressure of liquid in said line for opening and closing said switch as the pressure rises and falls respectively in said line, and means actuated by abnormal strain on said hose for opening said switch and temporaril rendering said pressure actuated means ine ective to close it.

14. In a liquid dispensing system, a liquid delivery line including a flexible'hose, a control valve at the delivery end of said hose,

- electrically operated means for forcing liquid through said line, a switch to control said means, means actuated by the pressure of liquid in saidline for opening and closing said switch as the, pressure rises and falls respectively in said line, means for locking said control valve against opening when the hose is not in use, and means independent of said locked valve for preventing the switch from being closed while said'valve is locked. 15. In a liquiddispensing system, a liquid delivery line including a flexible hose, a o

'valved hose nozzle at the delivery end of said hose, electrically operated means for forcing liquid through said line, a switch to control said means, means actuated by the pressure of liquid in said line for opening and closing said switch as the pressure rises and falls respectively in said line, means for supporting said nozzle whennot in use, and means for preventing said switch from open 'ing under the action of said pressure actuated means when said nozzle is on said support.

In testimony whefeof I have afiixed my signature.

WARREN H. DE LANCEY. 

